/*
 *  Copyright 2012, Tera-soft Co., Ltd.  All right reserved.
 *
 *  THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF TERA-SOFT CO.,
 *  LTD.  THE CONTENTS OF THIS FILE MAY NOT BE DISCLOSED TO THIRD
 *  PARTIES, COPIED OR DUPLICATED IN ANY FORM, IN WHOLE OR IN PART,
 *  WITHOUT THE PRIOR WRITTEN PERMISSION OF TERA-SOFT CO., LTD
 *
 */
package com.tansun.easycare.rule.utils;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.tansun.rule.utils.LoggerManager;


/**
 * @author WY
 */
public class JsonUtil {


    /**
     * Object转Json格式
     *
     * @param obj Object
     * @return String
     */
    @SuppressWarnings(value = {"unchecked"})
    public static String object2json(Object obj) {
        StringBuilder json = new StringBuilder();
        if (obj == null || "null".equals(obj.toString())) {
            json.append("null");
        } else if (obj instanceof String || obj instanceof Integer
                || obj instanceof Float || obj instanceof Boolean
                || obj instanceof Short || obj instanceof Double
                || obj instanceof Long || obj instanceof BigDecimal
                || obj instanceof BigInteger || obj instanceof Byte) {
            json.append("\"").append(string2json(obj.toString())).append("\"");
        } else if (obj instanceof Object[]) {
            json.append(array2json((Object[]) obj));
        } else if (obj instanceof List) {
            json.append(list2json((List<?>) obj));
        } else if (obj instanceof Map) {
            json.append(map2json((Map<?, ?>) obj));
        } else if (obj instanceof Set) {
            json.append(set2json((Set<?>) obj));
        } else {
            json.append(bean2json(obj));
        }
        return json.toString();
    }

    /**
     * Bean转Json格式
     *
     * @param bean bean
     * @return String
     */
    public static String bean2json(Object bean) {
        StringBuilder json = new StringBuilder();
        json.append("{");
        PropertyDescriptor[] props = null;
        try {
            props = Introspector.getBeanInfo(bean.getClass(), Object.class)
                    .getPropertyDescriptors();
        } catch (IntrospectionException e) {
            LoggerManager.error(e.getMessage(), e, JsonUtil.class);
        }
        if (props != null) {
            for (int i = 0; i < props.length; i++) {
                try {
                    String name = object2json(props[i].getName());
                    Annotation[] antot = props[i].getReadMethod().getAnnotations();
                    if (antot != null && antot.length > 0) {
                        JsonIgnore jsonIgnore = props[i].getReadMethod().getAnnotation(JsonIgnore.class);
                        if (jsonIgnore != null) {
                            if (jsonIgnore.value()) {
                                continue;
                            }
                        }
                    }
                    String value = object2json(props[i].getReadMethod().invoke(
                            bean));
                    json.append(name);
                    json.append(":");
                    json.append(value);
                    json.append(",");
                } catch (Exception e) {
                    LoggerManager.error(e.getMessage(), e, JsonUtil.class);
                }
            }
            json.setCharAt(json.length() - 1, '}');
        } else {
            json.append("}");
        }
        return json.toString();
    }

    /**
     * List转Json格式
     *
     * @param list list
     * @return String
     */
    public static String list2json(List<?> list) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (list != null && list.size() > 0) {
            for (Object obj : list) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }

    /**
     * List转Json格式
     *
     * @param list list
     * @return String
     */
    public static String collection2json(Collection<?> list) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (list != null && list.size() > 0) {
            for (Object obj : list) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }

    /**
     * 数组转Json格式
     *
     * @param array array
     * @return String
     */
    public static String array2json(Object[] array) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (array != null && array.length > 0) {
            for (Object obj : array) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }

    /**
     * Map转Json格式
     *
     * @param map map
     * @return String
     */
    public static String map2json(Map<?, ?> map) {
        StringBuilder json = new StringBuilder();
        json.append("{");
        if (map != null && map.size() > 0) {
            for (Object key : map.keySet()) {
                json.append(object2json(key));
                json.append(":");
                json.append(object2json(map.get(key)));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, '}');
        } else {
            json.append("}");
        }
        return json.toString();
    }

    /**
     * Set转Json格式
     *
     * @param set set
     * @return String
     */
    public static String set2json(Set<?> set) {
        StringBuilder json = new StringBuilder();
        json.append("[");
        if (set != null && set.size() > 0) {
            for (Object obj : set) {
                json.append(object2json(obj));
                json.append(",");
            }
            json.setCharAt(json.length() - 1, ']');
        } else {
            json.append("]");
        }
        return json.toString();
    }

    /**
     * String转Json格式，特殊字符的转换
     *
     * @param s string
     * @return String
     */
    public static String string2json(String s) {
        if (s == null) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            switch (ch) {
                case '"':
                    sb.append("\\\"");
                    break;
                case '\\':
                    sb.append("\\\\");
                    break;
                case '\b':
                    sb.append("\\b");
                    break;
                case '\f':
                    sb.append("\\f");
                    break;
                case '\n':
                    sb.append("\\n");
                    break;
                case '\r':
                    sb.append("\\r");
                    break;
                case '\t':
                    sb.append("\\t");
                    break;
                case '/':
                    sb.append("\\/");
                    break;
                default:
                    if (ch >= '\u0000' && ch <= '\u001F') {
                        String ss = Integer.toHexString(ch);
                        sb.append("\\u");
                        for (int k = 0; k < 4 - ss.length(); k++) {
                            sb.append('0');
                        }
                        sb.append(ss.toUpperCase());
                    } else {
                        sb.append(ch);
                    }
            }
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        list.add("aaa");

        System.out.println(JsonUtil.object2json(list));


    }
}
